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Cisco Discovery Protocol (CDP) is a proprietary data link layer protocol developed by Cisco Systems in 1994 [1] by Keith McCloghrie and Dino Farinacci. It is used to share information about other directly connected Cisco equipment, such as the operating system version and IP address .
CDP was created by Cisco in 1994. [2] Its original intent was to make it easier to find other devices on a network. [1] CDP may be used between Cisco routers, switches and other network equipment to advertise their software version, capabilities and IP address.
Most Cisco switches use src/dst MAC address hash as distribution method, meaning that a single session will use the bandwidth of a single interface. Other Cisco switches uses a proprietary distribution method which enable true frame round-robin, enabling maximum link speed to be the same as the sum of the interfaces composing the aggregation group.
On-Demand Routing ("ODR") is an enhancement to Cisco Discovery Protocol (CDP), a protocol used to discover other Cisco devices on either broadcast or non-broadcast media. With the help of CDP, it is possible to find the device type, the IP address, the Cisco IOS version running on the neighbor Cisco device, the capabilities of the neighbor device, and so on.
The Link Layer Discovery Protocol (LLDP) is a vendor-neutral link layer protocol used by network devices for advertising their identity, capabilities, and neighbors on a local area network based on IEEE 802 technology, principally wired Ethernet. [1]
IEEE 802.1Q, often referred to as Dot1q, is the networking standard that supports virtual local area networking (VLANs) on an IEEE 802.3 Ethernet network. The standard defines a system of VLAN tagging for Ethernet frames and the accompanying procedures to be used by bridges and switches in handling such frames.
CDP is also responsible for dynamically communicating the Voice VLAN value from the Cisco switch to the Cisco VoIP Phone. Under Cisco's pre-standard scheme, the PSE (switch) will send a fast link pulse (FLP) on the transmit pair. The PD (device) connects the transmit line to the receive line via a low-pass filter. The PSE gets the FLP in return.
Space Data Link Protocol, one of the norms for Space Data Link from the Consultative Committee for Space Data Systems; STP Spanning Tree Protocol; Split multi-link trunking Protocol; Token Ring a protocol developed by IBM; the name can also be used to describe the token passing ring logical topology that it popularized.